Originally posted by Supaglu
Under the steering column find the wiring harness that goes to the igntion lock, it may have 4 or 6 wires. Trace the "starter" wire (black & white I think) cut this and take both ends to a new 4 pin relay - pins 30 and 87 (the end that comes from the switch put to pin 30)
Loop a connection from pin 30 onto pin 86. Take the connection from pin 85 to your choice of switch and the other connection of the switch to a good earth point. When the switch is "on" then your ignition key will work as normal, when off the key will be dead.
Another way I have done it is not to use a switch but use the wiring on the back of for example your rear heated window switch, find a wire on the rear of the hrw that is earthed when pushed in and off when released - hence when you leave your car unattended if you leave the hrw switch pushed in then your starter cannot be turned from the igniton switch.
so could i also wire my fuel pump switch like that also, but instead of the ignition wire its the wire to the fuel pump??